Right. Well for gaming I mean... You pay a considerable amount of extra money but the performance difference between R7 3700x and R5 3600 is unnoticeable. It's about 1-2 FPS increase for 100 euros of investment according to the benchmarks I've seen so far. And I also read that manual overclocking doesn't get you anywhere.I'm not sure what you mean by that... there's considerable difference in performance. It most depends on how you measure it and how you use it.
Extra cores for doing other stuff might be a different story.